﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace calculatorFrom
{
    interface Calculate
    {
        // 表达式求值
        string calculate(String expression);
        // 基础运算
        double add(double num_a, double num_b);
        double minus(double num_a, double num_b);
        double multoply(double num_a, double num_b);
        double divide(double num_a, double num_b);
        double mod(double num_a, double num_b);

    }
}
